Right now
The most recent data we hold from NOAA arrived 5 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 16 May 2026 at 02:45 UTC. It is kept here as a record.
It is the 3rd strongest of the 17 detections recorded within 20 km of this point since 23 April 2026. The last comparable one was on 15 May 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 15 at 9:04PM CDT until May 15 at 9:45PM CDT by NWS Sioux Falls SD
How we know
Confirmed by 16 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 70% |
| Coordinates | 42.6640, -95.1240 |
| Nearest City | Fort Dodge (80 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-16T02:04:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.ed08f5e463b57c253969814c1f8dc68234267223.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Buena Vista, IA |
| Headline | Severe Thunderstorm Warning issued May 15 at 9:04PM CDT until May 15 at 9:45PM CDT by NWS Sioux Falls SD |
| Expires | 2026-05-15T21:45:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Newell |
| Iem County | Buena Vista |
| Iem State | IA |
| Iem Wfo | FSD |
| MergedSources | [{"id":"iem_H_42.660_-94.240_1778895900000","source":"iem","severity":"low","severityValue":25,"timestamp":1778895900000,"latitude":42.66,"longitude":-94.24},{"id":"iem_H_42.740_-94.680_1778890860000","source":"iem","severity":"low","severityValue":25,"timestamp":1778890860000,"latitude":42.74,"longitude":-94.68},{"id":"iem_H_43.330_-95.050_1778883600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778883600000,"latitude":43.33,"longitude":-95.05},{"id":"iem_H_42.470_-95.660_1778890080000","source":"iem","severity":"low","severityValue":25,"timestamp":1778890080000,"latitude":42.47,"longitude":-95.66},{"id":"iem_H_42.400_-95.610_1778892480000","source":"iem","severity":"low","severityValue":25,"timestamp":1778892480000,"latitude":42.4,"longitude":-95.61},{"id":"iem_H_42.340_-95.470_1778890200000","source":"iem","severity":"low","severityValue":25,"timestamp":1778890200000,"latitude":42.34,"longitude":-95.47},{"id":"iem_H_42.350_-95.880_1778887140000","source":"iem","severity":"low","severityValue":25,"timestamp":1778887140000,"latitude":42.35,"longitude":-95.88},{"id":"iem_H_42.420_-95.520_1778893020000","source":"iem","severity":"low","severityValue":25,"timestamp":1778893020000,"latitude":42.42,"longitude":-95.52},{"id":"iem_H_42.340_-95.520_1778890080000","source":"iem","severity":"low","severityValue":25,"timestamp":1778890080000,"latitude":42.34,"longitude":-95.52},{"id":"iem_H_42.710_-95.510_1778895720000","source":"iem","severity":"low","severityValue":25,"timestamp":1778895720000,"latitude":42.71,"longitude":-95.51},{"id":"iem_H_42.280_-95.440_1778895240000","source":"iem","severity":"low","severityValue":25,"timestamp":1778895240000,"latitude":42.28,"longitude":-95.44},{"id":"iem_H_42.630_-95.270_1778888160000","source":"iem","severity":"low","severityValue":25,"timestamp":1778888160000,"latitude":42.63,"longitude":-95.27},{"id":"iem_H_42.980_-95.690_1778888940000","source":"iem","severity":"low","severityValue":25,"timestamp":1778888940000,"latitude":42.98,"longitude":-95.69},{"id":"iem_H_42.460_-95.810_1778887920000","source":"iem","severity":"low","severityValue":25,"timestamp":1778887920000,"latitude":42.46,"longitude":-95.81},{"id":"iem_H_42.600_-95.000_1778888580000","source":"iem","severity":"low","severityValue":25,"timestamp":1778888580000,"latitude":42.6,"longitude":-95}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.